/**
 * Copyright 2007-2008 Vidar Svansson
 *     
 * This file is part of JAdapter.
 * 
 * JAdapter is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * JAdapter is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with JAdapter.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jadapter.registry;

import org.jadapter.Adapter;

/**
 * Lighter alternative to {@link TransitiveAdapterRegistry} as it does not 
 * retain a transitive closure of transformation paths.
 * Use this implementation if transitivity is not wanted.
 * 
 * 
 * @author Vidar Svansson
 * @since 0.2
 * @see TransitiveAdapterRegistry
 */
public class TransientAdapterRegistry extends AbstractAdapterRegistry {

	AdapterContainer.SimpleAdapterContainer container;

    private int registerCount = 0;

    public TransientAdapterRegistry(){
        container = new AdapterContainer.SimpleAdapterContainer();
    }

    public TransientAdapterRegistry(Adapter ... adapters) {
		this();
		container.register(adapters);
	}
	

	public <T> T transform(Object context, Class<T> type) {
		if(type.isInstance(context)) {
            return type.cast(context);
        }
		Adapter<T,Object> adapter = container.findAdapter(context, type);
		return adapter.transform(context);
	}


	public void register(Adapter<?, ?> adapter) {
		container.register(adapter);
        registerCount++;
	}

    public int size() {
        return registerCount;
    }
}
